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Tuniq Ensemble 1200W Review

Testing (Continued):

Efficiency and Power Factor

I was not too dissapointed with the failure of the Ensemble to meet the claim of Super High Efficiency (87%). The stated typical efficiency of 80% is nearer the mark at low and medium loads with high loads producing around 70% efficiency. I have, however, passed this power supply. It didn't meet its claimed efficiency or the ATX12V recommended minimum efficiency but it did meet the required minimum efficiency at all loadings.

Output And Efficiency

DC Load (W)

AC Load (VA)

AC Load (W)

PF

Efficiency (%)

Pass/Fail

173

256

216

0.84

80

Pass

463

621

574

0.92

81

Pass

637

872

825

0.94

77

Pass

770

1077

1060

0.95

72

Pass

1138

1643

1598

0.97

71

Pass

AC Ripple on DC Outputs

The noise levels at the AC mains frequency of 50Hz and after rectification at 100Hz are well within acceptable levels. The maximum noise level occurred at the switching frequency of the power supply, which is approximately 62.5kHz. Lets have a look....

Above: Screenshots of AC Noise on 3V3 and 5V0 rails.

Above: Screenshots of AC Noise on 12V1 and 12V2 rails.

Above: Screenshots of AC Noise on 12V3 and 12V4 rails.

Above: Screenshots of AC Noise on -12V and 5VSB rails.

Tuniq Ensemble 1200W AC Ripple/Noise Measurements

DC Output

+3V3

+5V0

+12V1

+12V2

+12V3

+12V4

-12V0

+5VSB

Ripple (mV )

48

45

35

43

28

24

70

60

Pass/Fail

Pass

Pass

Pass

Pass

Pass

Pass

Pass

Fail

In an ideal world, what I would really like to see is zero noise but in reality, this is never going to happen on any ATX power supply. I measured the peak to peak AC signal, in millivolts, to see how each rail compared against the ATX12V standard. The above table records the maximum AC noise amplitude results during my 1138W load test. The six main voltage rails fall inside the ATX12V specification, with a minor hiccup on the +5VSB rail (60mV against the standard maximum of 50mV).